arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.3467astro-ph.CO
收藏

四个kpc级双星活动星系核的发现

Discovery of Four kpc-Scale Binary AGNs

Xin Liu, Jenny E. Greene, Yue Shen, Michael A. Strauss

摘要:

我们报告发现了四个kpc尺度的双星活动星系核。这些天体最初是从斯隆数字巡天计划中根据其光纤光谱中的双峰[O III] 4959,5007发射线选择的。双峰可能是由于星系合并中成对的活动超大质量黑洞(SMBH)造成的,也可能是由于单个SMBH周围窄线区域气体的整体运动造成的。深近红外(NIR)图像和光学狭缝光谱获得的麦哲伦6.5米和APO 3.5米望远镜强烈支持二进制SMBH的情况下,四个对象。在每个系统中,近红外图像显示潮汐特征和双恒星组件与几个千秒差距的投影分离,而光学狭缝光谱显示两个塞弗特2核空间上与恒星组件一致,视线速度偏移几百公里/秒。这些物体是从只有43个物体的样本中提取的,证明了这种技术在寻找kpc级双星活动星系核方面的效率。

英文摘要:

We report the discovery of four kpc-scale binary AGNs. These objects were originally selected from the Sloan Digital Sky Survey based on double-peaked [O III] 4959,5007 emission lines in their fiber spectra. The double peaks could result from pairing active supermassive black holes (SMBHs) in a galaxy merger, or could be due to bulk motions of narrow-line region gas around a single SMBH. Deep near-infrared (NIR) images and optical slit spectra obtained from the Magellan 6.5 m and the APO 3.5 m telescopes strongly support the binary SMBH scenario for the four objects. In each system, the NIR images reveal tidal features and double stellar components with a projected separation of several kpc, while optical slit spectra show two Seyfert 2 nuclei spatially coincident with the stellar components, with line-of-sight velocity offsets of a few hundred km/s. These objects were drawn from a sample of only 43 objects, demonstrating the efficiency of this technique to find kpc-scale binary AGNs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑